Improvement in mica lamp-chimneys



P. WARE. Mica Lamp Chimney.

Patented March 3, 1863.

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N. PETERS Pholu-LNhngmphx-r. Wuhinglon. D C.

UNITED STATES PATENT OFFICE.

W. POWELL WARE, OF NEW YORK, N. Y.

IMPROVEMENT IN MICA LAMP-CHIMNEYS.

Specification forming part of Letters Patent No. 37,837, dated March 3, 1863.

To all whom itmay concern Be it known that I, W. POWELL WARE, of the city, county, and State of New York, have invented a new and Improved Mica Lamp- Ghimney; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a perspective view of my invention; Fig. 2, a horizontal section of the same, taken in the line .r 00, Fig. 1.

Similar letters of reference indicate corresponding parts in the two figures.

The mica lampchimneys hitherto invented have all been of conical or cylindrical form, or of elliptical or other curved form, in their transverse or horizontal section, resembling somewhat the glass chimneys. The curving or bending of the mica in order that it may assume or have the proper curve to suit the form of the chimneys aforesaid causes the inner laminathat is to say, that at the concave side of the mica-to become corrugated and also to split and shell, so as to produce interstices for small unconsumed particles of can bon to lodge in, and in a short time the mica becomes much discolored and nearly opaque, so as to render the chimney entirely worthless, for the mica cannot be cleaned Without shelling oft the layers or lamina: of mica and making holes entirely through it. This contingency renders the mica chimneys as hitherto constructed a failure. When first introdueed, they met with a ready sale, but now there are but few manufactured, and will probably soon cease to be used at all.

This invention consists in constructing a mica chimney with a frame arranged in such a manner that the mica may be inserted in it in flat slabs or planes, whereby the lamina: of the mica will not be disturbed or disarranged in the least on either side, and a clear transparent medium obtained for the trans mission of the light, and one which will admit of being cleaned or washed without injuring or shelling.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents the base of the chimney, which is formed of a band or annular rim, or, to fit on the burner of the lamp, and having a square flange, b, at its upper edge, to the corners or angles of which there are attached the lower ends of the standards 0 of the chimneyframe. These standards '0 may be formed each of two pieces of angle-iron, 1 2, (see Fig. 2,) fitted one within the other and connected by rivets or other proper means. The upper ends of the standards are connected by crosspieces d, and the lower ends by cross-pieces e. The spaces or recesses between the two an glepieces 1 2 of the standards creceive the edges of mica slabs B, and serve to hold the same in proper position, and a suitable cement may. if necessary, be used to secure the edges of the mica slabs between the auglepieces 1 2 of the standards. The lower cross-pieces, e, are grooved at their upper edges to receive the lower edges of the mica slabs, or said cross-pieces may be formed each of two plates connected together so as to form a space between them to receive the mica. The standards c are somewhat inclined, so that the chimney will be of pyramidal form, as shown clearly in Fig. 1, and thereby have the requisite draft to supply the flame of the lamp with a sufiiciency of air to insure proper combustion.

I do not confine myself to this precise mode of constructing the chimney as regards the form of the frame, for a trilateral, hexagonal, or other polygonal fornr may be made, and the flat slabs of mica inserted in it so as to answer the same purpose as the quadrilateral one just described. By having the mica inserted in the framein flat slabs the mica remains in its normal condition or in the same state, as regards the disposition of its laminae, as when formed by nature, and hence a smooth surface is retained at both sides of each slab, which will admit of being cleaned or rubbed when ever necessary without danger of shelling, and which consequently may be kept clean and transparent for an indefinite period of time.

Having thus described my invention, I claim as new and desire to secure by Letters Patent as an improved article of manufacture- A mica lamp-chimney formed of a frame constructed in such a manner as to admit of the insertion of flat slabs or planes of mica, substantially as herein set forth.

W. POWELL WARE Witnesses:

M. S. PARTRIDGE, DANIEL RoBEE'rsoN. 

